Somewhere between a traditional button-down, a henley and a polo—where the weather's warm and you don't need reservations for dinner—resides the woven pull-over. The unlikely hybrid has been embraced by brands both big (Gap just came out with one) and small (Phillip Lim, A-Z Collection and Folk to name a few). Long-sleeved, with a half placket of just three or four buttons, the lightweight shirt is the perfect companion to a pair of beat-up chinos or board shorts. And thus, feel free to keep it untucked.

1.) Conference of Birds Allenby shirt, $245; 2.) Gap plaid popover, $50; 3.) Velour noah shirt, $219; 4.) Folk grandad shirt, $88.

• Conference of Birds, designed by Andrew Holden, is named after an Arabic poem from the 12th-century.